American intercontinental ballistic missile. Initial fully operational version of Atlas ICBM. Differed in guidance system from Atlas F. Deployed as missiles from 1960 to 1966. After retirement, the ICBM's were refurbished and used over twenty years as space launch vehicles.

The SM-65EAtlas E was an improved SM-65D. It used a more accurate Mk.4 reentry vehicle, had an improved propulsion system (designated MA-3), and used an all-inertial guidance system developed by Bosch Arma, which was originally planned for the HGM-25A Titan I. With this navigation system, located in the distinctive large bulge on the side of the missile, the Atlas E could reach an accuracy of about 600 m (2000 ft) CEP. Component testing on modified Atlas D missiles began in March 1960, and in February 1961 the first full Atlas E flight occurred. The SM-65E became operational in September 1961. Because the all-inertial guidance system did away with the necessity to launch the missile close to the launch control center of the base, the Atlas E was deployed in widely dispersed patterns. Adding also new semi-buried coffins, the Atlas E was significantly better (but still not satisfactorily) protected against a preemptive strike than the D model. The USM-65E was the unarmed training version of the Atlas E.

The vehicles converted for space launch use and launched from Vandenberg AFB used a radio guidance system that was based on a modification of the General Electric Radio Tracking System (GERTS), originally employed on the Atlas D. In fact, the GERTS guidance used for space launch employed one of the original radar stations used for the Atlas D and even used some actual Atlas D components in its Pulse Beacon Decoder, the vehicle's X-band radio transponder. Newer solid state computers were used to run the guidance software and were interfaced with the radar; eventually they were made redundant, although with a human operator charged with detecting failure.

The large Bosch-Arma pod on the side of the Atlas E and F space boosters launched from Vandenberg AFB from the mid-70's to the mid-90's was in fact empty. It was not removed and replaced with a more streamlined fairing since that would have cost money and gained no significant performance.
So, the Atlas E and F space boosters used Atlas E and F ICBM airframes and engines with the tanks modified with a new payload interface section, a mixture of Atlas E and F components (selected based on which designs were most suitable for the space launch mission) and a modified Atlas D radio guidance system.

GERTS was a complex, glitch-prone system, its only saving graces being that it was both the cheapest guidance system around and the most reliable, operating for almost 30 years without one flight failure and at a per-flight cost an order of magnitude below that of an inertial guidance system. Prior to Apollo-Saturn, all U.S. manned orbital flights used GERTS, both on the Mercury-Atlas D and the Gemini-Titan II missions.

The proper way to refer to the space booster Atlas E's and F's
was "Atlas E-F Space Booster," because of the mix of configuration features.
Of course, individually the boosters were referred to by their "Tail
Numbers" such as 19F, 76E, 68E, etc.
The total launched cost of an
Atlas E-F space booster was about $15M - or less than 1-3 the cost of a
Titan II space booster, and less than 1-20th what was finally admitted as
the cost of a single Space Shuttle mission.
About 35 unmodified Atlas E-F missiles in storage at Norton AFB were
scrapped in the early 1970's. The Space Shuttle was coming and it was
assumed that they were not needed. The cost of maintaining
them in storage was "horrendous" - about $2000 each per year. At least a half billion dollars worth of perfectly usable, incredibly
cheap space boosters (equivalent to a couple of billon dollars in
replacement costs) were run over with a bulldozer in order to save perhaps one million dollars in storage costs overtwenty years . The Air
Force officer who recommended this travesty of planning received a medal for
his farsightedness.

Tiros N American earth weather satellite. 6 launches, 1978.10.13 (Tiros N) to 2002.06.24 (NOAA 17). Tiros N was part of the ongoing US series of polar-orbiting weather satellites. These were preceded by the TIROS series and the ITOS (Improved TIROS) series. More...

Atlas The Atlas rocket, originally developed as America's first ICBM, was the basis for most early American space exploration and was that country's most successful medium-lift commercial launch vehicle. It launched America's first astronaut into orbit; the first generations of spy satellites; the first lunar orbiters and landers; the first probes to Venus, Mars, Mercury, Jupiter, and Saturn; and was America's most successful commercial launcher of communications satellites. Its innovative stage-and-a-half and 'balloon tank' design provided the best dry-mass fraction of any launch vehicle ever built. It was retired in 2004 after 576 launches in a 47-year career. More...

DMSP The first CORONA photos in August 1960 convinced authorities that knowledge of cloud cover over Russia was necessary and could be obtained only via satellite. Since the civilian TIROS program could not yet meet the requirement, the Director, National Reconnaissance Office authorized an 'interim' effort - the Defense Meteorological Satellite Program. The satellite series continued to be updated and served into the 21st Century. More...

Tiros TIROS spacecraft were the beginning of a long series of polar-orbiting meteorological satellites. TIROS was followed by the TOS (TIROS Operational System) series, and then the ITOS (Improved TIROS) series, and later the NOAA series. TIROS spacecraft were developed by GSFC and managed by ESSA (Environmental Science Services Administration). The objective was to establish a global weather satellite system. More...

Associated Launch Sites

Cape Canaveral America's largest launch center, used for all manned launches. Today only six of the 40 launch complexes built here remain in use. Located at or near Cape Canaveral are the Kennedy Space Center on Merritt Island, used by NASA for Saturn V and Space Shuttle launches; Patrick AFB on Cape Canaveral itself, operated the US Department of Defense and handling most other launches; the commercial Spaceport Florida; the air-launched launch vehicle and missile Drop Zone off Mayport, Florida, located at 29.00 N 79.00 W, and an offshore submarine-launched ballistic missile launch area. All of these take advantage of the extensive down-range tracking facilities that once extended from the Cape, through the Caribbean, South Atlantic, and to South Africa and the Indian Ocean. More...

Vandenberg Vandenberg Air Force Base is located on the Central Coast of California about 240 km northwest of Los Angeles. It is used for launches of unmanned government and commercial satellites into polar orbit and intercontinental ballistic missile test launches toward the Kwajalein Atoll. More...

Cape Canaveral LC11 Atlas launch complex. The complex was built for the Atlas ballistic missile program. Launch sites 11 to 14 were accepted between August 1957 and mid-April 1958. Complex 11 supported 28 Atlas launches and five Atlas Advanced Ballistic Reentry System flights between 19 July 1958 and 2 April 1964. Complexes 11, 12 and 14 were deactivated in 1967. More...